nitg: fix C return type of callbacks to Nit

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>

diff --git a/src/compiler_ffi.nit b/src/compiler_ffi.nit
index 6588b1b..df9eddd 100644 (file)
--- a/src/compiler_ffi.nit
+++ b/src/compiler_ffi.nit
@@ -393,6 +393,7 @@ redef class MExplicitCall
                if return_mtype != null then
                        assert ret_var != null
                        return_mtype = return_mtype.anchor_to(v.compiler.mainmodule, recv_mtype)
+                       ret_var = nitni_visitor.autobox(ret_var, return_mtype)
                        nitni_visitor.ret_to_c(ret_var, return_mtype)
                end
                nitni_visitor.add("\}")